Scaffold jack



C. M. JAHN Sept. 19, 1961 SCAFFOLD JACK Filed Feb. 8, 1960 Fig.2

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ATTORNEY 3,000,605 SCAFFOLD JACK Carl M. Jahn, 2640 St. Paul St.,Denver, C050. Filed Feb. 8, 1960, Ser. No. 7,476 6 Claims. (Cl. 248240)This invention relates to facilities useful in various orders and stagesof building construction and related operations to transiently supportscaifolding, platforms, and the like, from and exteriorly of verticalwall structures, and more particularly to such facilities adapted forexpeditious functional coaction with features conventionallycharacterizing outer face areas of concrete wall forms, and has as anobject to provide a novel and improved scafiold jack of uniquelyadvantageous utility.

A further object of the invention is to provide a novel andimprovedscaflold jack that is simple and convenient of detachable useassociation with and removal from conventionally-featured concrete wallforms by a single operator without recourse to other equipment orspecial tools.

' A further object of the invention is to provide a novel and improvedscaffold jack that is compact in a unitary organization conditioned forimmediate practical use.

' A further object of the invention is to provide a novel and improvedscaffold jack that is dependably secure in self-sustaining coaction withcharacteristic features of conventional concrete wall forms.

A further object of the invention is to providea novel and improvedscaffold jack that is susceptible of expedient, economical production inany appropriate size range from readily-available materials.

i A further object of the invention is to provide a novel and improvedscaifold jack that is rugged and durable throughout a long life ofrepetitious use.- A further object of the invention is to provide anovel and improved construction and operative organization of elementsconstituting a scaffold jack especially adapted for advantageous useassociation with conventionally-featured concrete wall forms.

With the foregoing and other objects in view, my invention consists inthe construction, arrangement, and operative combination of elements ashereinafter set forth, pointed out in my claims, and illustrated by theaccompanying drawing, in which- FIGURE 1 is a fragmentary,somewhat-diagrammatic,

perspective view of a conventionally-featured concrete wall formexterior areas in supporting coaction with a typical embodiment of theinvention. I

FIGURE 2 is a vertical, end elevational View, on a relatively-enlargedscale, of the jack unit according to FIG- URE 1 as positioned in andseparated from the mounted association thereof distinguishing thepreceding view.

FIGURE 3 is a top plan view of the jack unit as represented by FIGURE 2,an alternative limiting position of relatively-movable componentsthereof being indicated by broken lines.

FIGURE 4 is a side elevational view of the jack unit according to thepreceding views with the movable components thereof disposed asrepresented by the broken line showings of FIGURE 3.

As fragmentarily typified by FIGURE 1, it is common practice to organizeconcrete wall forms from suitable, vertically-disposed, fiat panelmembers 10 spacedly interrelated by means of conventional tie-rodshaving headed terminal portions 11 arranged to project exteriorly of thepanel traversed by the rod for coaction with a clamp bracket 12 adaptedto receive and support a brace timber 13 thereby tightly pressed againstthe associated panel in reaction to adjustment of a wedge plate 14effective between and to separate opposed areas of each said bracket 12and the head of the rod terminal portion 11 coacting Patented Sept.19,1961

therewith. In some diversity of structural particularity, the clampbrackets 12 extensively in use are of open loop form presenting athrough opening parallel to and beneath the timber l3 operativelyassociated therewith, to and from which opening transit in a directionperpendicular to the panel is inhibited, and it is customary in theerection of forms comprised from the panel, tie-rod, clamp bracket, andtimber elements just discussed to arrange the tie-rods with theirassociated brackets in uniformly spaced alignment both vertically andhorizontally of the form wall, whereby to establish a vertical,uniformlyspaced series of horizontally-disposed brace timbers 13cxteriorly of the completed form structure. Incident to the erection,and to the ultimate impletion, of the forms constituted as herein setforth there is frequent occasion for workmen to function at elevationsalong the form beyond normal reach from the ground, or other form base,with consequent necessity for scaffolding supplemental to the form wall,or walls, and the instant invention is hence directed to the provisionof a novel, improved, fully practical, and advantageous scaffold jackexpedient of operative association with conventional concrete formscharacterized by clamp brackets of laterally-open loop type insupporting relation with horizontal brace timbers.

In any appropriate size and strength of its rigid confponents, and in arange of component dimensions and proportions operatively coactable withthe dimensional characteristics of conventional spacings andarrangements of the form wall features, the improved jack of theinvention is a unitary assembly of foldably-related elements cooperablyintegrated with a straight, rigid, expedientlytubular member 15 of adiametric size freely and loosely receivable in and through the lateralopenings of the conventional clamp brackets 12 and of a length to spanbetween, engage Within, and desirably extend at each end slightly beyondthe clamp brackets 12 of an adjacently spaced pair thereof supporting ahorizontal beam 13 in a given conventional form wall arrangement.Securely affixed to and inwardly adjacent the ends of the member 15,rigid arms 16 of material similar to or the same as that of said memberare spaced apart along the'latter a distance less than the spacingbetween adjacent clamp brackets 12 such as will permit shift of themember 15 axially to release of one or the other of its ends fromengagement therewith, and said arms 16 extend, preferably with moderateconvergence, outwardly from the same side of said member in a commonplane radial of the latter an equal distance to terminate in opposed,inturned ends rotatably supporting a sleeve 17 in axial parallelism withthe member 15. In a length feasibly approximating that of the member 15,the arms 16 are adapted to outstand perpendicularly from a form wallhaving clamp brackets 12 traversed by ends of the member 15, as indicated in FIGURE 1, and thereby provide a horizontal platform for thesupport of planks, decking, and the like, whereon workmen may operate,in which disposition said arms are disposed and maintained by a strut 18of suitable rigid, eXpediently-tubular material affiXed centrally to andradially of the sleeve 17 in a length terminated by a transverse,angular shoe 19 such as to incline inwardly of the form wall toengagement of said shoe with the beam 13 second below that adjacent themember 15 when the plane of the arms 16 is substantially horizontal.Operable as a loaded bearing member, the shoe i9 is provided insubstantial length and symmetrical attachment to the strut 18 toconformably overlie an up per, outer corner of the beam thereby engagedand, in the interest of safety and security, said shoe is formed with ahole 20 through the Web thereof vertical in position of jack use for theaccommodation of a nail in seated relaable connection of the shoe to thebeam in a manner inhibiting their accidental separation. Distributionand minimizing of the load applied to the clamp brackets through themember therewith engaged is the function of a second angular shoe 21afiixed along one of its flange margins to and generally tangentially ofthe member 15 between the arms 16 to dispose its free flange spacedlyparallel to the plane of said arms and directed across the said memberaway from the arms, whereby to present the said free flange of the shoe2,1 for overlap on and bearing engagement with the upper outer corner ofthe beam 13 immediately superjaceut the member 15 as associated inposition of use therewith. The free flange of the shoe 21 parallel tothe plane of the arms 16 is spaced from and radially of the member 15 adistance appropriate to accommodate the thickness ofconventionally-sized beams 13 and the spacing of the member 15 therefromincident to coaction of the latter with the clamp brackets 12, and thefixed flange of said shoe is oflset moderately and toward the sleeve 17from the peripheral zone of the member 15 whereto it is marginallyattached in order to effect intended secure interengagement of said shoeand beam as said member is rotated in mounted association with the clampbrackets to elevate the sleeve 17 for operative positioning of the strut18, as shown and described. The operatively-complete jack unit thus fardescribed is advantageously supplemented by a tubular socket 222 fixedto and radially of the sleeve 17 in an angular relation such as toextend said socket above and substantially perpendicular to the plane ofthe arms 16 when the member 15 and strut 18 are engaged with theappropriate form wall components for attachment of the jack unit inposition of use thereto, in which relationship and disposition thesocket 22 functions as a stop to limit lateral displacement of looseplanks, decking, and the like, outwardly of the form wall away fromsupport on and by the jack unit arms 16 and is simultaneously availablefor convenient attachment to the mounted jack unit of uprights therebydisposed to serve as, or to mount, safeguards for those utilizing thescaffold.

Practical use and operation of the improvement should be reasonablymanifest. In appropriate size and lightweight construction foldable tocompact form about the axis of the sleeve 17, as in F GURE 4, the jackis a unit manipulable by a single operator to use position on, ordetachment from, a form wall of appropriate conventional organization.Upon occasion for an elevated scaffold along a form wall characterizedby vertically-spaced, horizontal beams seated in horizontally-spaced,laterallyopen clamp brackets, the jack unit of the inventionsizeproportioned to the conventional beam and bracket spacing of theform wall is a practical reusable facility conservative of materials andlabor. Alike in a length of member 15 suited to span between andend-engage through horizontally-paired, adjacent clamp brackets of theform wall and a length of strut l8 appropriately correlated with thevertical spacing separating the form wall beams, a plurality of the jackunits is mounted on and in spaced, horizontal succession along the wallwith the arms 16 thereof horizontally coplanar in outward projectionfrom the wall for the reception and support of scaffold floor elements.Each of the jack units is assembled to the form wall by first enteringone end of the member laterally through a selected bracket 12 while theunit arms 16 are inclined outwardly and downwardly of the wall, shiftingthe entered member 15 axially through the bracket engaged thereby untilthe other end of the member clears the complementary bracket of thepair, reversely shifting said member to engagement at its free endthrough said complementary bracket, upwardly rocking the arms 16 on theaxis of the so-engaged member to embracing coaction of the shoe 21 withthe upper outer corner of the beam superjacent the member 15 and to aposition accommodating seating of the strut shoe 19 on the upper outercorner of a subjacent beam, and finally securing said shoe 19 to itsbeam with a nail entered 4 through the hole 20 of the shoe. Secure andstable in the wall-mounted disposition shown and described, the jackunit functions in a horizontal, spaced succession of like facilities toposition and support scaffold floor members applied thereto, loosely orin any feasible fixed relation, for the accommodation of workmen,materials, and equipment, hand grips, steady poles, and protective railsbeing supplied in detachable coaction with the vertically and upwardlydirected sockets 22 of the several jack units as may be deemed to berequisite or desirable. Disassembly of the erected scalfold and recoveryof the several jack units in condition for immediate reuse is an obviousreversal of the procedures above outlined susceptible of effectuation bya single workman without recourse to specialized equipment or tools.

Since changes, variations, and modifications, in the form, construction,and arrangement of the elements shown and described may be had withoutdeparting from the spirit of my invention, I wish to be understood asbeing limited solely by the scope of the appended claims, rather than byany details of the illustrative showing and foregoing description.

I claim as my invention:

l. A scaffold jack particularly adapted for operative association withvertical walls of concrete forms secured in use position by meansincluding; spacedlycorrelated, laterally-open brackets stationarilyprotruding outwardly from the form wall and beams supported in edgeengagement with the wall on and spanning between the brackets in eachhorizontal succession thereof,

said jack comprising a rigid, planar frame formed with spacedly-parallelside members, coaligned end portions of one of said members oppositelyextended beyond the frame receivable in corresponding journaledengagement through the lateral openings of contiguous,horizontallypaired brackets subjacent and parallel to the beam supportedthereby, whereby to hingedly link said frame to the wall for actuationthrough a vertical arc plane-perpendicular to the wall, an angular shoeaffixed intermediately of and to parallel said one member as a clipactuable with and opening away from the frame adapted to conformablyengage over an opposed salient corner of the adjacent beam as anincident of and to upwardly limit frame actuation in its journaledmounting, and means radial of and connected for angular adjustmentrelative to the other of said parallel side members selectivelycoactable with other beam components of the wall to retain said frame atthe upward limit of its actuable range established by inter-engagementof said shoe and beam.

2. A scaffold jack particularly adapted for operative association withvertical walls of concrete forms secured in use position by meansincluding; spacedly-correlated, laterally-open brackets stationarilyprotruding outwardly from the form Wall and beams supported in edgeengagement with the wall on and spanning between the brackets in eachhorizontal succession thereof, said jack comprising a rigid, planarframe formed with spacedlyparallel side members, coaligned end portionsof one of said members oppositely extended beyond the frame receivablein corresponding journaled engagement through the lateral openings ofcontiguous horizontally-paired brackets subjacent and parallel to thebeam supported thereby, whereby to hingedly link said frame to the wallfor actuation through a vertical arc plane-perpendicular to the wall, anangular shoe affixed intermediately of and to parallel said one memberas a clip actuable with and opening away from the frame adapted toconformably engage over an opposed salient corner of the adjacent beamas an incident of and to upwardly limit frame actuation in its journaledmounting, a rigid strut radial of and connected for angular adjustmentrelative to the other of said parallel side members, and a shoediametrically terminating said strut for selective coaction with salientcorners of other beam components of the wall at the upward limit of therange of frame actuation established by interengagement of said firstshoe and beam.

3. A scaffold jack particularly adapted for operative association withvertical walls of concrete forms secured in use position by meansincluding; spacedly-correlated, laterally-open brackets stationarilyprotruding outwardly from the form wall and beams supported in edgeengagement with the wall on and spanning between the brackets in eachhorizontal succession thereof, said jack comprising a rigid, planarframe formed with spacedlyparallel side members, coaligned end portionsof one of said members oppositely extended beyond the frame receivablein corresponding journaled engagement through the lateral openings ofcontiguous, horizontally paired brackets subjacent and parallel to thebeam supported thereby, whereby to hingedly link said frame to the wallfor actuation through a vertical arc plane-perendicular to the wall, anangular shoe affixed intermediately of and to parallel said one memberas a clip actuable with and opening away from the frame adapted toconformably engage over an opposed salient corner of the adjacent beamas an incident of and to upwardly limit frame actuation in its journaledmounting, an elongated sleeve rotatably embracing the other of saidparallel side members, a rigid strut fixed radially of said sleeve, anda shoe diametrically terminating said strut parallel to said first shoefor selective coaction with salient corners of other beam components ofthe wall at the upward limit of the range of frame actuation establishedby interengagement of said first shoe and beam.

4. The organization according to claim 3, wherein a socket openingradially of the sleeve is afiixed thereto in an angular relation withthe strut such as to upstand from and substantially perpendicular to theplane of the mounted frame when the latter is held by the strut at theupward limit of its range of actuation.

5. A scaffold jack particularly adapted for operative association withvertical walls of concrete forms secured in use position by meansincluding spacedly-correlated, laterally-open brackets stationarilyprotruding outwardly from the form wall and beams supported in edgeengage! ment with the wall on and spanning between the brackets in eachhorizontal succession thereof, said jack comprising a straight, rigidmember rotably receivable through lateral openings of said brackets in alength exceeding the horizontal spacing separating adjacent brackets ofa pair thereof, complementary arms end-fixed in spaced relation to andinwardly from the ends of said member defining a plane radial thereof,an elongated sleeve rotatably conjoining ends of said arms remote fromsaid member in spaced parallelism with the latter, a rigid strut fixedradially of said sleeve, an angular shoe diametrically terminating saidstrut parallel to said member disposed for bearing coaction with a beamcorner, and a second angular shoe marginally afiixed to said memberbetween said arms as a clip opening away from said arms above the planecommon thereto.

6. A scaffold jack particularly adapted for operative association withvertical Walls of concrete forms secured in use position by meansincluding; spacedly-correlated, laterally-open brackets stationarilyprotruding outwardly from the form wall and beams supported in edgeengagement with the wall on and spanning between the brackets in eachhorizontal succession thereof, said jack comprising a straight, rigidmember rotatably receivable through lateral openings of said brackets ina length exceeding the horizontal spacing seeparating adjacent bracketsof a pair thereof, complementary arms end-fixed in spaced relation toand inwardly from the ends of said member defining a plane radialthereof, an elongated sleeve rotatably conjoining ends of said armsremote from said member in spaced parallelism with the latter, a rigidstrut fixed radially of said sleeve, a socket fixed radially of saidsleeve in obtusely-angular opposition to said strut, an angular shoediametrically terminating said strut parallel to said member disposedfor bearing coaction with a beam corner, a passage for accommodation ofa fastener intersecting said shoe, and a second angular shoe marginallyaflixed to said member between said arms as a clip opening away fromsaid arms above the plane common thereto.

References Cited in the file of this patent UNITED STATES PATENTS1,760,803 Wilth May 27, 1930 1,852,723 Orton Apr. 15, 1932 2,444,746Newbold July 6, 1948

